Robert Mundheim, a lawyer at the firm, is advising the bank's board on whether it should claw back pay of Chief Executive John Stumpf, Chief Operating Officer Timothy Sloan and former retail banking head Carrie Tolstedt, according to the WSJ report.

Wells Fargo has come under fire for sales abuses at the bank where employees opened as many as 2 million accounts in customers' names without their authorization.

The bank had said its board will assess whether to cancel or claw back any incentive compensation paid to Tolstedt, a now-retired executive at the center of the scandal.

Wells Fargo and Mundheim declined to comment.

(Reporting by Diptendu Lahiri in Bengaluru and David Henry in New York; Editing by Shounak Dasgupta)